北苏鲁荣成地区超高压变质带的形成与折返动力学
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摘要
山东省荣成地区位于苏鲁高压-超高压变质带的东北部,以花岗质片麻岩、副片麻岩为主,夹有少量的榴辉岩、石榴辉石岩、麻粒岩、超基性岩、石英岩、大理岩和斜长角闪岩等,各类岩石的锆石中普遍含有柯石英包裹体,表明荣成地区岩石曾经历超高压变质作用过程。荣成地区区域构造格架表现为面理产状总体为NNE-SSW走向,向南转为由NE-SW走向,呈弧形展布,倾向SE或SSE,超高压变质岩石由一系列近平行的剪切岩片组成,岩片之间的分界线为一些韧性剪切带,是折返阶段角闪岩相-绿片岩相的产物。结合野外宏观变形现象、显微构造分析以及糜棱岩中石英的优选方位EBSD(eleetron backscatterdiffraction,电子背散射技术)测量结果,可以判断北苏鲁荣成地区韧性剪切带主要形成于中、低温(550～350℃)条件,并具有由NW向SE"斜向正滑"的剪切指向。根据韧性剪切带中所含的榴辉岩透镜体的显微构造和绿辉石与金红石的优选方位的EBSD的研究,重塑超高压变质阶段的流变学特征:绿辉石和金红石都具有高温的滑移系组构模式。横穿苏鲁高压-超高压变质带的地震反射剖面揭示了苏鲁高压-超高压变质带呈厚10km以上的穹形板片,位于苏鲁高压-超高压变质板片下部的荣成及江苏刘山以韧性正断裂系列为主。Ar-Ar测年结果表明,发生这种伸展韧性剪切作用的时间在117～130Ma。位于板片上部的南苏鲁以韧性逆冲性断裂系列为主。基于以上各方面的研究,进一步验证了苏鲁超高压-超高压变质带折返动力学的挤出模式。
Rongcheng of Shandong Province is located at northeast of Sulu UHP (ultrahigh-pressure) metamorphic terrane. It is composed of gneiss, paragneiss, eclogites, garnet pyroxenite, ultramafic rocks, granulites, quartzite, marble and amphibolites. Coesites as a reliable marker of ultra-high pressure environment are found in eclogites, quartzites, gneisses, marbles and amphibolites. The occurrence of mylonites extends NNE-SSW at the north part and NW-SE at the south part. Different parallel slices compositing the Rongcheng UHP metamorphic terranes are divided by some ductile shear zones (about 2km). Based on field work microstructural analyses and EBSD studies of quartz, a conclusion is arrived; These ductile shear zones are approximately SE trending normal faults. Lattice-preferred orientation (LPO) of omphacite and garnet in several eclogite samples of Rongcheng were determined from electron backscatter diffraction (EBSD) technique shows that; LPO of omphacite and rutile are characterized by high temperature type, where as garnet appears to be randomly oriented. From the original seismic reflection profile of Sulu UHP terrane an erosion antrform structure is shown. Rongcheng and Liushan normal faults are situated in the lower part of this antiform, and southern Sulu thrusts are situated in the above part. Ar-Ar dating study results indicates these normal faults were formed at 117～130Ma. Based on the petrologic, geochemical, structural studies, the extrusion model of Sulu UHP terrane is verified further.
Rongcheng of Shandong Province is located at northeast of Sulu UHP (ultrahigh-pressure) metamorphic terrane. It is composed of gneiss, paragneiss, eclogites, garnet pyroxenite, ultramafic rocks, granulites, quartzite, marble and amphibolites. Coesites as a reliable marker of ultra-high pressure environment are found in eclogites, quartzites, gneisses, marbles and amphibolites. The occurrence of mylonites extends NNE-SSW at the north part and NW-SE at the south part. Different parallel slices compositing the Rongcheng UHP metamorphic terranes are divided by some ductile shear zones (about 2km). Based on field work microstructural analyses and EBSD studies of quartz, a conclusion is arrived; These ductile shear zones are approximately SE trending normal faults. Lattice-preferred orientation (LPO) of omphacite and garnet in several eclogite samples of Rongcheng were determined from electron backscatter diffraction (EBSD) technique shows that; LPO of omphacite and rutile are characterized by high temperature type, where as garnet appears to be randomly oriented. From the original seismic reflection profile of Sulu UHP terrane an erosion antrform structure is shown. Rongcheng and Liushan normal faults are situated in the lower part of this antiform, and southern Sulu thrusts are situated in the above part. Ar-Ar dating study results indicates these normal faults were formed at 117～130Ma. Based on the petrologic, geochemical, structural studies, the extrusion model of Sulu UHP terrane is verified further.
引文
Ames L, Tilton GR and Zhou G. 1993． Timing of collision of the Sino-Korean and Yangtze cratons:U-Pb zircon dating of coesite-bearing eclogites. Geology, 21:339-342
Arderson TB and Jamerit B. 1990． Uplift of deep crust during orogenic extensional collapse:A model based on fiedld studies in the SogSunnfjord region of western Norway. Tectonics, 9:1097-111
Ballevere M, Lagabrille Y and Merlr O. 1990． Tertiary ductile normal faulting as a consequence of lithospheric stackong in the Western Alps. Memoires de la Societe geologique de France, 156:227-236
Bascou J, Barruol G, Vauchez A, Mainprice D, Tommasi A and Egydio-Silva M. 2001． Eclogite seismic properties from EBSP-derived omphacite lattice preferred orientations. Tectonophysics, 342:61-79
Blanchin LA, Bursill C and Lafage. 1990． Deformation and microstructure of rutile deformation and microstructure of rutile. M. G. Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, 429:175-202
Boucher. 1977． Lequartz et la cinematique des zones ductiles. These, A L'U. E. R, des Sciences de la Nature de L' Universite de Nantes
Boundy TM, Fountain DM and Austrheim H. 1992． Structural development of clinopyroxene lattice preferred orientations in eclogites. Journal of Structural Geology, 24:1357-1368
Brunei M and Maliakov Y. 1972． Utilisation de l'orientation preferentielle du quartz comme marqueur de Ia deformation hercynienne dans Ie granite prehercynien du Mendic (Massif Central francais) . C. R. Ac. Sc. , Paris, 2627-2630
Buatier M, Van Roermund HLM, Drury MR and Lardeaux JM. 1991． Deformation and recrystallisation mechanisms in naturally deformed omphacites from the Sesia-Lanzo zone;geophysical consequences. Tectonophysics, 195:11-27
Carter NL, Christie JM and Griggs DT. 1964． Experimental deformation and recrystallization of quartz. J. Geol. , 72:687-733
Chemenda AI, Mattauer M, Malavielle J and Bokun AN. 1995． A mechanism for syn-collisional rock exhumation and associated normal faulting:Results from physical modeling. Earth and Planetary Science Letters, 132:225-232
Chemenda AI, Mattauer M and Bokun AN. 1996． Continetal subduction and a mechanism for exhuamation of high-pressure metamorphir rocks: New modeling and field data from Oman. Earth and Planetary Science Letters, 143 : 173-182
Faure M, Lin W and Le Breton N. 2001． Where is the North China-South China block boundary in eastern China. Geology, 29: 119-122
Godard G and Van Roermund HLM. 1995． Deformation-induced clinopyroxene fabrics from eclogites. J. Struct. Geol. , 17; 1425-1443
Hara I, Takeda K and Kimura T. 1973． Preferred lattice orientation of quartz in shear deformation. J. Sci. Hiroshima Univ. , 7 (1 ) : 1-11
Harison CGA. 1992． Rates of continental erosion and mountain building. Proceeding of the 29th IGC, Kyoto, Japan, 2
Helmstaedt H, Anderson DL and Gacasci AT. 1972． Petrofabric studies of eclogite, spinel websterite, and spinel-iherzolite xenoliths from kimberlite-bearing breccia pipes in southeastern Utah and northeastern Arizona. Journal of Geophysical Research, 77 : 4350-4365
Ji SC. 1988． Tectonic significance of partial melting (1) : Experiment study on transition of deformation mechanism. Acta Geoscientia Sinica, 4: 347-356 (in Chinese with English abstract)
Kato T, Enami M and Zhai M. 1997． Ultra-high-pressure (UHP) marble and eclogite in the Su-Lu UHP terrane, eastern China. Journal of Metamorphic Geology, 15: 169-182
Koppers AAP. 2002． Software for~(39) Ar/~(40) Ar age calculations. Computers and Geosciencs, 28: 605-619
Li SG, Hart SR, Zhang SG et al. 1989． Timing of collision between North and South China blocks: The Sm-Nd isotopic age evidence. Science in China (Series D) , 32: 1393-1400
Li SG, Jagoutz E, Chen YZ et al. 2000． Sm-Nd and Rb-Sr isotopic chronology and cooling history of ultrahigh pressure metamorphie rocks and their country rocks at Shuanghe in the Dabie Mountains,central China. Geochimica et Cosmochimica Acta, 64; 1077-1093
Liou JG, Zhang RY, Ernst WG et al. 1998． High-pressure minerals from deeply subducted metamorphic rocks. Review in Mineralogy and Geochemistry, 37 : 33-96
Liou JC, Hacker BR and Zhang RY. 2000． Into the forbidden zone. Science, 287: 1215-1216
Liu FL, Xu ZQ, Katayama 1 et al. 2001． Mineral in clusions in zircon of para-and orthogneiss from prepilot drillhole CCSD-PP1 , Chinese Continetal Scientific Drilling Project. Lithos, 59: 199-215
Liu FL, Xu ZQ, Yang JS, Zhang ZM, Xue HM and Li TF. 2004． Geochemical characteristics and UHP metamorphism of granitic gneisses in the main drilling hole of Chinese Continental Scientific Drilling Project and its adjacent area. Acta Petrologica Sinica, 20 (1) : 9-26
Maruyama S, Liou JG and Zhang R. 1994． Tectonic evolution of the ultrahigh-pressure ( UHP) and high-pressure ( HP) metamorphic slices from central China. The Island Arc, 3: 112-121
Mauler A, Godard G and Kunze K. 2001． Crystallographic fabrics of omphacite, rutile and quartz in Vendee eclogites ( Armorican Massif, France) . Consequences for Deformation Mechanism and Regimes.Tectonophysics, 342: 81-112
Orzol J, Trepmann CA, Stb'ckhert B et al. 2003． Critical shear stress for mechanical twinning of jadeite-an experimental study. Tectonophysics, 372; 135-145
Platt JP. 1993． Exhumation of high-pressure rocks; A review of concepts and processes. Terra Nova, 5:119-133
Qiu HJ, Xu ZQ, Zhang ZM, Yang JS, Yang TN, Zhang JX and Li HB.2002． New mineral evidence of high-pressure metamorphism of the Subei high-pressure belt; Aragonite inclusions in garnet from greenschist. Geologica Bulletin of China, 21 (10) :617-624 (in Chinese with English abstract)
Wang QC, Ishiwateri A, Zhao ZU et al. 1993． Coesite-bering granulite retrograded from eclogite in Weihai, eastern China. J. Mineral, 5:141-152
Xu ZQ, Zhang ZM, Liu FL, Yang JS, Li HB, Yang TN, Qiu HJ, Li TF, Meng FC, Chen ZZ, Tang ZM and Chen FY. 2003． Exhumation structure and mechanism of the Sulu ultrahigh-pressure metamorphic belt, central China. Acta Geologica Sinca, 77 (4 ) : 433-450 (in Chinese with English abstract)
Xu ZQ, Zeng LS, Liang FH et al. 2005． A dynamic model for sequential subduction and exhumation of the Sulu HP-UHP metamorphic terrane.Acta Petro logica et Mineralogica,24 (5) : 357-368
Xu ZQ, Qi XX, Yang JS et al. 2006． Deep subduction erosion model for continet-continet collision of the Sulu HP-UHP metamorphic terrain. Earth Science-Journal of China University of Geosciences ,31(4) :427-436 (in Chinese with English abstract)
Yang WC, Hu ZY, Cheng ZY et al. 1999． Long profile of geophysical investigation from Tancheng to Lianshui, east-central China. Chinese Journal of Geophysics, 42(2) : 206-217 (in Chinese with English abstract)
Ye K, Yao YP, Ikuo Katayama, Cong BL and Wang QC. 2000． Large areal extent of ultrahigh-pressure metamorphism in the Sulu ultrahigh-pressure terrane of East China: New implications from coesite and omphacite inclusions in zircon of granitic gneiss. Lithos,52: 157-164
Zhai MG, Guo JH, Wang QC et al. 2000． Division of petrological-tectonic units in the northern sulu ultra-high pressure zone: An example of thick-skin thrust of crystalline units. Scientia Geologica Sinica, 35(1) : 16-26( in Chinese with English abstract)
Zhang RY, Liou JG and Ernst WCG. 1995． Ultrahigh-pressure metamorphism and decompressional P-T paths of eclogites and country rocks from Weihai, eastern China. The Island Arc, 4 : 293-309
Zhang RY, Liou JC and Shu JF. 2002． Hydroxyl-rich topaz in high-pressure and ultrahigh-pressure kyanite quartzite with retrograde woodhouseite, from the Sulu terrane, eastern China. American Mineralogist, 87: 445-453
嵇少丞.1988． 部分熔融的构造地质意义(1) :变形机制转变的实验研究.地质科学,4:347-356
邱海峻,许志琴,张泽明,杨经绥,杨天南,张建新和李海兵.2002． 苏北高压变质带绿片岩中石榴石内文石包裹体的发现.地质通报,21(10) :617-624
许志琴,张泽明,刘福来,杨经绥,李海兵,杨天南,邱海峻,李天福,孟繁聪,陈志忠,唐哲民和陈方远.2003． 苏鲁高压-超高压变质带的折返构造及折返机制.地质学报,77(4) :433-450
许志琴,戚学祥,杨经绥等.2006,苏鲁高压-超高压变质地体的陆-陆碰撞深俯冲剥蚀模式.地球科学,31:427-436
杨文采,胡振远,程振远等.1999． 郯城-涟水综合地球物理剖面.地球物理学报,42(2) :206-217
翟明国,郭敬辉,王清晨等.2000． 苏鲁变质带北部的岩石构造单元及结晶块体推覆构造.地质科学,35:16-26
Arderson TB and Jamerit B. 1990． Uplift of deep crust during orogenic extensional collapse:A model based on fiedld studies in the SogSunnfjord region of western Norway. Tectonics, 9:1097-111
Ballevere M, Lagabrille Y and Merlr O. 1990． Tertiary ductile normal faulting as a consequence of lithospheric stackong in the Western Alps. Memoires de la Societe geologique de France, 156:227-236
Bascou J, Barruol G, Vauchez A, Mainprice D, Tommasi A and Egydio-Silva M. 2001． Eclogite seismic properties from EBSP-derived omphacite lattice preferred orientations. Tectonophysics, 342:61-79
Blanchin LA, Bursill C and Lafage. 1990． Deformation and microstructure of rutile deformation and microstructure of rutile. M. G. Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, 429:175-202
Boucher. 1977． Lequartz et la cinematique des zones ductiles. These, A L'U. E. R, des Sciences de la Nature de L' Universite de Nantes
Boundy TM, Fountain DM and Austrheim H. 1992． Structural development of clinopyroxene lattice preferred orientations in eclogites. Journal of Structural Geology, 24:1357-1368
Brunei M and Maliakov Y. 1972． Utilisation de l'orientation preferentielle du quartz comme marqueur de Ia deformation hercynienne dans Ie granite prehercynien du Mendic (Massif Central francais) . C. R. Ac. Sc. , Paris, 2627-2630
Buatier M, Van Roermund HLM, Drury MR and Lardeaux JM. 1991． Deformation and recrystallisation mechanisms in naturally deformed omphacites from the Sesia-Lanzo zone;geophysical consequences. Tectonophysics, 195:11-27
Carter NL, Christie JM and Griggs DT. 1964． Experimental deformation and recrystallization of quartz. J. Geol. , 72:687-733
Chemenda AI, Mattauer M, Malavielle J and Bokun AN. 1995． A mechanism for syn-collisional rock exhumation and associated normal faulting:Results from physical modeling. Earth and Planetary Science Letters, 132:225-232
Chemenda AI, Mattauer M and Bokun AN. 1996． Continetal subduction and a mechanism for exhuamation of high-pressure metamorphir rocks: New modeling and field data from Oman. Earth and Planetary Science Letters, 143 : 173-182
Faure M, Lin W and Le Breton N. 2001． Where is the North China-South China block boundary in eastern China. Geology, 29: 119-122
Godard G and Van Roermund HLM. 1995． Deformation-induced clinopyroxene fabrics from eclogites. J. Struct. Geol. , 17; 1425-1443
Hara I, Takeda K and Kimura T. 1973． Preferred lattice orientation of quartz in shear deformation. J. Sci. Hiroshima Univ. , 7 (1 ) : 1-11
Harison CGA. 1992． Rates of continental erosion and mountain building. Proceeding of the 29th IGC, Kyoto, Japan, 2
Helmstaedt H, Anderson DL and Gacasci AT. 1972． Petrofabric studies of eclogite, spinel websterite, and spinel-iherzolite xenoliths from kimberlite-bearing breccia pipes in southeastern Utah and northeastern Arizona. Journal of Geophysical Research, 77 : 4350-4365
Ji SC. 1988． Tectonic significance of partial melting (1) : Experiment study on transition of deformation mechanism. Acta Geoscientia Sinica, 4: 347-356 (in Chinese with English abstract)
Kato T, Enami M and Zhai M. 1997． Ultra-high-pressure (UHP) marble and eclogite in the Su-Lu UHP terrane, eastern China. Journal of Metamorphic Geology, 15: 169-182
Koppers AAP. 2002． Software for~(39) Ar/~(40) Ar age calculations. Computers and Geosciencs, 28: 605-619
Li SG, Hart SR, Zhang SG et al. 1989． Timing of collision between North and South China blocks: The Sm-Nd isotopic age evidence. Science in China (Series D) , 32: 1393-1400
Li SG, Jagoutz E, Chen YZ et al. 2000． Sm-Nd and Rb-Sr isotopic chronology and cooling history of ultrahigh pressure metamorphie rocks and their country rocks at Shuanghe in the Dabie Mountains,central China. Geochimica et Cosmochimica Acta, 64; 1077-1093
Liou JG, Zhang RY, Ernst WG et al. 1998． High-pressure minerals from deeply subducted metamorphic rocks. Review in Mineralogy and Geochemistry, 37 : 33-96
Liou JC, Hacker BR and Zhang RY. 2000． Into the forbidden zone. Science, 287: 1215-1216
Liu FL, Xu ZQ, Katayama 1 et al. 2001． Mineral in clusions in zircon of para-and orthogneiss from prepilot drillhole CCSD-PP1 , Chinese Continetal Scientific Drilling Project. Lithos, 59: 199-215
Liu FL, Xu ZQ, Yang JS, Zhang ZM, Xue HM and Li TF. 2004． Geochemical characteristics and UHP metamorphism of granitic gneisses in the main drilling hole of Chinese Continental Scientific Drilling Project and its adjacent area. Acta Petrologica Sinica, 20 (1) : 9-26
Maruyama S, Liou JG and Zhang R. 1994． Tectonic evolution of the ultrahigh-pressure ( UHP) and high-pressure ( HP) metamorphic slices from central China. The Island Arc, 3: 112-121
Mauler A, Godard G and Kunze K. 2001． Crystallographic fabrics of omphacite, rutile and quartz in Vendee eclogites ( Armorican Massif, France) . Consequences for Deformation Mechanism and Regimes.Tectonophysics, 342: 81-112
Orzol J, Trepmann CA, Stb'ckhert B et al. 2003． Critical shear stress for mechanical twinning of jadeite-an experimental study. Tectonophysics, 372; 135-145
Platt JP. 1993． Exhumation of high-pressure rocks; A review of concepts and processes. Terra Nova, 5:119-133
Qiu HJ, Xu ZQ, Zhang ZM, Yang JS, Yang TN, Zhang JX and Li HB.2002． New mineral evidence of high-pressure metamorphism of the Subei high-pressure belt; Aragonite inclusions in garnet from greenschist. Geologica Bulletin of China, 21 (10) :617-624 (in Chinese with English abstract)
Wang QC, Ishiwateri A, Zhao ZU et al. 1993． Coesite-bering granulite retrograded from eclogite in Weihai, eastern China. J. Mineral, 5:141-152
Xu ZQ, Zhang ZM, Liu FL, Yang JS, Li HB, Yang TN, Qiu HJ, Li TF, Meng FC, Chen ZZ, Tang ZM and Chen FY. 2003． Exhumation structure and mechanism of the Sulu ultrahigh-pressure metamorphic belt, central China. Acta Geologica Sinca, 77 (4 ) : 433-450 (in Chinese with English abstract)
Xu ZQ, Zeng LS, Liang FH et al. 2005． A dynamic model for sequential subduction and exhumation of the Sulu HP-UHP metamorphic terrane.Acta Petro logica et Mineralogica,24 (5) : 357-368
Xu ZQ, Qi XX, Yang JS et al. 2006． Deep subduction erosion model for continet-continet collision of the Sulu HP-UHP metamorphic terrain. Earth Science-Journal of China University of Geosciences ,31(4) :427-436 (in Chinese with English abstract)
Yang WC, Hu ZY, Cheng ZY et al. 1999． Long profile of geophysical investigation from Tancheng to Lianshui, east-central China. Chinese Journal of Geophysics, 42(2) : 206-217 (in Chinese with English abstract)
Ye K, Yao YP, Ikuo Katayama, Cong BL and Wang QC. 2000． Large areal extent of ultrahigh-pressure metamorphism in the Sulu ultrahigh-pressure terrane of East China: New implications from coesite and omphacite inclusions in zircon of granitic gneiss. Lithos,52: 157-164
Zhai MG, Guo JH, Wang QC et al. 2000． Division of petrological-tectonic units in the northern sulu ultra-high pressure zone: An example of thick-skin thrust of crystalline units. Scientia Geologica Sinica, 35(1) : 16-26( in Chinese with English abstract)
Zhang RY, Liou JG and Ernst WCG. 1995． Ultrahigh-pressure metamorphism and decompressional P-T paths of eclogites and country rocks from Weihai, eastern China. The Island Arc, 4 : 293-309
Zhang RY, Liou JC and Shu JF. 2002． Hydroxyl-rich topaz in high-pressure and ultrahigh-pressure kyanite quartzite with retrograde woodhouseite, from the Sulu terrane, eastern China. American Mineralogist, 87: 445-453
嵇少丞.1988． 部分熔融的构造地质意义(1) :变形机制转变的实验研究.地质科学,4:347-356
邱海峻,许志琴,张泽明,杨经绥,杨天南,张建新和李海兵.2002． 苏北高压变质带绿片岩中石榴石内文石包裹体的发现.地质通报,21(10) :617-624
许志琴,张泽明,刘福来,杨经绥,李海兵,杨天南,邱海峻,李天福,孟繁聪,陈志忠,唐哲民和陈方远.2003． 苏鲁高压-超高压变质带的折返构造及折返机制.地质学报,77(4) :433-450
许志琴,戚学祥,杨经绥等.2006,苏鲁高压-超高压变质地体的陆-陆碰撞深俯冲剥蚀模式.地球科学,31:427-436
杨文采,胡振远,程振远等.1999． 郯城-涟水综合地球物理剖面.地球物理学报,42(2) :206-217
翟明国,郭敬辉,王清晨等.2000． 苏鲁变质带北部的岩石构造单元及结晶块体推覆构造.地质科学,35:16-26
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